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To reduce the memory footprint, this patch no longer loads the JSON data
completely into memory. Instead, there is an SQL database based on
`ExpireCacheSQLite`.
The class CurrenciesDB is a simple DB application that encapsulates the
DB (queries and initialization) and provides convenient methods like
`name_to_iso4217` and `iso4217_to_name`.
Related:
- https://github.com/searxng/searxng/discussions/1892
- https://github.com/searxng/searxng/pull/3458#issuecomment-2900807671
- https://github.com/searxng/searxng/pull/4650
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
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